663992375 has 32 divisors (see below), whose sum is σ = 882498240. Its totient is φ = 497049600.

The previous prime is 663992363. The next prime is 663992377. The reversal of 663992375 is 573299366.

It is not a de Polignac number, because 663992375 - 2¹⁸ = 663730231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663992377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409316 + ... + 410934.

It is an arithmetic number, because the mean of its divisors is an integer number (27578070).

Almost surely, 2^663992375 is an apocalyptic number.

663992375 is a deficient number, since it is larger than the sum of its proper divisors (218505865).

663992375 is a wasteful number, since it uses less digits than its factorization.

663992375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844 (or 1834 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 50.

The square root of 663992375 is about 25768.0494993315. The cubic root of 663992375 is about 872.4107948416.

The spelling of 663992375 in words is "six hundred sixty-three million, nine hundred ninety-two thousand, three hundred seventy-five".